题目
You work as a database administrator for Certkiller .com. You enabled tracing while creating a listener to your database. What additional information is available to you when you enable tracing？（）
A、Information about each Oracle Net connection.
B、Information about each entry in theLinstener.orafile
C、Information about the changed done in the database
D、Information about the different listeners in your system
E、Information about all thenondatabasefiles required to operate the database
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